/*
 * Copyright (C) 2012 by Zhang Li <RichSelian at gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef HEADER_NW_EXCEPTION_H
#define HEADER_NW_EXCEPTION_H

#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>

extern jmp_buf except_jbuf[1024];
extern size_t except_jpos;

#define nw_throw(e)                                                         \
    do {                                                                    \
        if(except_jpos > 0) {                                               \
            longjmp(except_jbuf[except_jpos - 1], (int)(e));                \
        } else {                                                            \
            fprintf(stderr, "unhandled exception [%d] caught at file %s, line %d.\n", (int)(e), __FILE__, __LINE__); \
            abort();                                                        \
        }                                                                   \
    } while(0)

#define nw_throw_if(e, stat)                                                \
    do {                                                                    \
        if(stat) {                                                          \
            nw_throw(e);                                                    \
        }                                                                   \
    } while(0)

#define nw_throws(...)

#define nw_try_block_start()                                                \
    do {                                                                    \
        jmp_buf* M_jbuf = &except_jbuf[except_jpos];                        \
        size_t M_jpos = (except_jpos++);                                    \
        int M_jret;                                                         \
        if((M_jret = setjmp(*M_jbuf)) == 0) {

#define nw_except(e)                                                        \
        } else if(M_jret == (int)(e)) {                                     \
            except_jpos = M_jpos;

#define nw_try_block_end()                                                  \
        } else {                                                            \
            nw_throw(M_jret);                                               \
        }                                                                   \
        except_jpos = M_jpos;                                               \
    } while(0)

#endif
